You can go to nearly any auto parts store and buy an array of LED's on a flexible strip that uses 12VDC. Pre-wired (except for the PS), and has 3M adhesive tape for mounting.
Several colors to choose from including the cool blue you have now.
Turner Model 1 C-LB, Seagull S6+, Ibanez 12 string, Dean Bavarian Vendetta
VOX AC50 CP2, Roland RE-20, Boss CE5
Kurzweil SP88X, Yamaha MM8, Roland R-5
TASCAM 38-8, Behringer SX4882, Alesis Midiverb III, Alesis Midiverb IV, DBX 262, DBX 266, Omnifex DDX1024, TASCAM DBX Type II NR
Sennheiser MD441, Shure SM57, SM7, Sennheiser 402's